[rationalmaximiser2]

Hi guys. As my first post I'd like to tell you about my Rubens Tube.

Materials
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1 1.9m 75mm gorrigated iron down pipe (Bunnings, $10)
1 1.9m 220x15mm pine
2 0.3m 220x15mm pine
1 jaycar 100mm speaker
  silicon rubber
1 200x200x7mm plastic plate (hole in middle for blowtorch thread)
1 blowtorch
1 set of $5 computer speakers (for the amp)
1 iphone with oscillator app

Design
======
65 2mm holes in the top, 20mm spacing.
Cut two big holes in the small bits of pine to house the pipe, attach on top of either end of the base. seal pipe flush to the end of the wood with silicon rubber. On one end, mount the speaker (silicon seal), on the other, the blowtorch/plate.

I've been able to demonstrate a standing wave at various frequencies, and use it as a great visualiser for music (youtube video on the way)

This is just something i knocked up as a pilot - I'm designing mach 2 now. Any suggestions? One thing I'll do is reduce the jet size, and spacing. Jets currently have difficulty lighting their adjacent flame.

By the way I'm not a pyhsics teacher, just an independent learner. I wonder if any schools would like to borrow the tube? I'd be happy to lend or demo. [ Invalid Attachment ]

[imatfaal]

Very cool - in fact from the look of those flames, very hot as well.  Look forward to the videos - but remember to hold safety first!